Materials Literature
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Piezoelectric compositions Pb(MnuNbvNiwTixZry)O3 where u+v+w+x+y = 1.0 were studied by means of X-ray powder diffractometry, scanning electron microscopy and thermal analytical techniques. These studies showed that Mn is incorporated into the tetragonal lattice as trivalent ions at the Ti, Zr octahedral (B) sites.
Abstract The stability of common soil minerals found in Ultisols was studied relative to their natural soil solution composition. The mineralogy of the clay fraction (<2 µm) ranged from 22 to 60% in kaolinite, 0 to 20% in gibbsite, 17 to 57% in hydroxyinterlayered vermiculite (HIV), and 1 to 12% in quartz. Ion acti…
The effects of alloying elements on σ phase precipitation in δ–γ duplex phase stainless steels have been studied with particular emphasis on the partitioning of alloying elements. Sigma phase precipitation occurred mainly through the eutectoid decomposition of δ into σ and γ phases. The concentrations of Cr, Mo, W, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet molecular oxygen in micellar systems. 1. Distribution equilibriums between hydrophobic and hydrophilic compartmentsPlato C. Lee and Michael A. J. RodgersCite this: J. Phys. Chem. 1983, 87, 24, 4894–4898Publication Date (Print):November 1, 1983Publication History Publ…
Films of polystyrene or polymethyl methacrylate were cast on oxidized silicon substrates, then detached by the application of gas or water pressure from the back side of the film through a hole in the substrate. Critical detachment pressures showed good repeatability and could be used to calculate the work of adhesion…
Abstract The formation and structure of chars produced on heating of cellulose, lignin, and wood have been investigated by FTIR and CP/MAS 13 C‐NMR, and the results have been discussed in conjunction with parallel permanganate oxidation studies reported before. These data show that when cellulose is heated for 5 min w…
Porous, multicomponent silicate gels were heated in flowing and pressurized ammonia. These treatments resulted in dense, homogeneous oxynitride (O‐N) glasses which were synthesized at low temperature (∼1000°C) without melting. The O‐N glasses exhibited increased microhardness and glass‐transition temperature and alter…
Exponentially growing cells of Bacillus subtilis and Escherichia coli were Gram stained with potassium trichloro(eta 2-ethylene)platinum(II) (TPt) in place of the usual KI-I2 mordant. This electron-dense probe allowed the staining mechanism to be followed and compared with cellular perturbations throughout the stainin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic conversion of primary amines to secondary amines and cyclization of polymethylene-.alpha.,.omega.-diamines by an aqueous suspension of titanium(IV) oxide/platinumSeiichi Nishimoto, Bunsho Ohtani, Tadao Yoshikawa, and Tsutomu KagiyaCite this: J. Am. Chem. Soc.…
Etude de l'influence de la structure du fer colloidal sur la croissance de la diatomee marine cotiere Thalassiosira pseudonana
The stability relations of prehnite and epidote were experimentally determined for the bulk composition of Ca2Al2FeSi3O12(0H) + excess H2O using conventional hydrothermal apparatus and solid oxygen buffer techniques. Three starting materials were used: (I) mixtures of natural prehnite and hematite, (II) mixtures of sy…
Filiform corrosion occurs on painted metals and cannot be prevented by conventional corrosion inhibitors. In order to better understand the corrosion phenomena, the literature was reviewed and the characteristics exhibited by filiform corrosion on different metals were cataloged. Calculations were performed to select…
The phase diagram of a one-dimensional many-electron system with site-diagonal electron-phonon(e-p) coupling and short-ranged inter-site electron-electron(e-e) repulsion as well as intra-site one is studied within the mean field theory for electrons and in the adiabatic limit for phonons. The theory covers the whole r…
An electromagnetic theory for the light absorption by a cluster of metal spheres and the Raman scattering by a molecule adsorbed on it is presented, which takes into account the retardation effect exactly and is applicable to an arbitrary cluster size. The theory is applied to a two-sphere cluster of Ag and Au. It is…
Ferroelectric films of lead zirconate titanate (PZT) have been fabricated by rf planar magnetron sputtering. Films having a resistivity &gt;106 Ω cm and a dielectric constant &gt;800 at 300 K have been achieved using 100% oxygen as a sputtering medium, 10% excess PbO added to the target, and appropriate post-d…
Abstract The results of this work suggest a practical route to hot-oil-resistant thermoplastic elastomers based on NBR and a polyolefin resin (such as polypropylene). Although these two types of polymer are normally grossly incompatible with each other, a melt-mixed blend thereof is technologically improved by the pre…
Evaluation of the velocity and stress time correlation functions of a liquid, using a simple but speculative model for liquid state dynamics, leads to a relation between self-diffusion and viscosity. The result resembles the Stokes–Einstein formula, and agrees reasonably well with experimental data.
The microzonation of photosynthetic organisms in four cyanobacterial mats of Solar Lake, Sinai, was studied by light and scanning electron microscopy. The zonation was compared to the distribution of photosynthesis and of O 2 , H 2 S, and pH. Microelectrodes were used to measure the chemical gradients as well as the p…
The Euclidean normalizers of space groups form the appropriate mathematical tool for several problems treated independently by crystallographers in the past, e.g. the comparison, the classification and the standardized description of crystal structures. Explicit tables are presented that enable the user to handle Eucl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of [7]circuleneKoji Yamamoto, Tadashi Harada, Masao Nakazaki, Takuo Naka, Yasushi Kai, Shigeharu Harada, and Nobutami KasaiCite this: J. Am. Chem. Soc. 1983, 105, 24, 7171–7172Publication Date (Print):November 1, 1983Publication History Publish…